U.S. patent number 10,576,247 [Application Number 15/420,685] was granted by the patent office on 2020-03-03 for intrabody surgical fluid transfer assemblies with adjustable exposed cannula to needle tip length, related systems and methods.
This patent grant is currently assigned to MRI Interventions, Inc.. The grantee listed for this patent is MRI Interventions, Inc.. Invention is credited to Jesse Flores, Peter G. Piferi.
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United States Patent |
10,576,247 |
Flores , et al. |
March 3, 2020 |
Intrabody surgical fluid transfer assemblies with adjustable
exposed cannula to needle tip length, related systems and
methods
Abstract
Devices for transferring fluid to or from a subject include an
elongate tubular cannula having opposing proximal and distal ends
with an axially extending lumen. The devices also include an
elongate needle having opposing proximal and distal ends. The
elongate needle is configured so that the distal end of the needle
extends out of the distal end of the cannula a suitable adjustable
distance. The devices also include a housing with a length
adjustment mechanism that adjusts a length between the tip of the
needle and the distal end of the tubular cannula.
Inventors: |
Flores; Jesse (Perris, CA),
Piferi; Peter G. (Orange, CA) |
Applicant: |
Name |
City |
State |
Country |
Type |
MRI Interventions, Inc. |
Irvine |
CA |
US |
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Assignee: |
MRI Interventions, Inc.
(Irvine, CA)
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Family
ID: |
58018260 |
Appl.
No.: |
15/420,685 |
Filed: |
January 31, 2017 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20170232229 A1 |
Aug 17, 2017 |
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Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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62382434 |
Sep 1, 2016 |
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62296323 |
Feb 17, 2016 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A61B
90/11 (20160201); A61M 39/10 (20130101); A61M
25/06 (20130101); A61M 25/0097 (20130101); A61M
25/0023 (20130101); A61M 25/0084 (20130101); A61M
2025/0089 (20130101); A61M 2025/0175 (20130101); A61M
2025/0042 (20130101) |
Current International
Class: |
A61M
25/00 (20060101); A61M 39/10 (20060101); A61B
90/11 (20160101) |
References Cited
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Primary Examiner: Farrar; Lauren P
Attorney, Agent or Firm: Myers Bigel, P.A.
Parent Case Text
RELATED APPLICATIONS
This application claims the benefit of and priority to U.S.
Provisional Application Ser. No. 62/296,323, filed Feb. 17, 2016,
and U.S. Provisional Application Ser. No. 62/382,434, filed Sep. 1,
2016, the contents of which are hereby incorporated by reference as
if recited in entirety herein.
Claims
That which is claimed is:
1. A surgical assembly for transferring fluid to or from a subject,
comprising: a tubular cannula having opposing proximal and distal
ends with an open axially extending lumen; an elongate needle
having opposing proximal and distal ends, wherein a length of the
needle extends through the tubular cannula lumen so that the distal
end of the needle with a tip extends out of the distal end of the
distal end of the tubular cannula to provide an exposed needle tip;
and a housing comprising opposing proximal and distal ends, wherein
the housing holds the tubular cannula with the needle with the
tubular cannula and needle extending out of the distal end of the
housing, wherein the housing comprises an internal length
adjustment mechanism that is attached to one or both of the tubular
cannula or the needle and that adjusts a length between the distal
end of the tubular cannula and the exposed needle tip, wherein the
elongate needle comprises a tube that extends through the housing
and the tubular cannula and defines the exposed needle tip, wherein
the tube of the elongate needle comprises a continuous length of
fused silica glass that extends out of both proximal and distal
ends of the housing, wherein the distal end of the needle has a
stepped configuration with a first segment having a first outer
diameter that merges into a second end segment having a second
smaller outer diameter having a length that extends to the tip of
the needle, and wherein the needle tip extends out of the tubular
cannula an adjustable distance of between about 2 mm to about 30
mm.
2. The assembly of claim 1, wherein the housing has a length from
about 1 inch to about 6 inches and comprises an external rotatable
member or a rotatable cylindrical outer wall that engages the
length adjustment mechanism to move at least one of the needle or
the tubular cannula longitudinally.
3. The assembly of claim 1, wherein the housing comprises an
external thumbwheel that engages an internal gear of the length
adjustment mechanism and that is attached to the tubular cannula or
the needle to longitudinally move the tubular cannula or the needle
to adjust the length, and wherein the tubular cannula is an outer
tubular cannula with a tapered distal end portion, and wherein the
exposed needle tip is configured to always be outside of the
tubular cannula.
4. The assembly of claim 1, wherein the length adjustment mechanism
comprises an internal screw, and wherein the housing comprises a
rotatable outer wall, and wherein, in response to rotation of the
outer wall of the housing, the internal screw longitudinally
translates to adjust the length between the distal end of the
tubular cannula and the exposed tip of the needle.
5. The assembly of claim 4, wherein the needle has a stroke
distance of between about 0.5 inches and 3 inches and has a
proximal end that extends a length outside a proximal end of the
housing.
6. The assembly of claim 1, wherein the housing holds a
longitudinally extending screw of the length adjustment mechanism
in the housing that is in communication with the rotatable outer
wall that can move longitudinally in response to the rotation of
the outer wall to adjust the length between the distal end of the
tubular cannula and the needle tip.
7. The assembly of claim 1, wherein the tube extends a distance
above the proximal end of the housing and through the housing to
define the exposed needle tip, the assembly further comprising a
luer connector attached to the tube above the proximal end of the
housing.
8. The assembly of claim 1, wherein the tubular cannula has an
outer polymeric coating and/or sleeve, wherein a distal end of the
tubular cannula is tapered so that it has a smaller outer diameter
at a tip of the tubular cannula relative to an outer diameter
rearward of the tip of the tubular cannula, and wherein a proximal
end of the tubular cannula terminates inside the housing.
9. The assembly of claim 1, wherein an outer surface of the tubular
cannula has a size and geometry adapted for use with a stereotactic
frame with a trajectory guide having a support column sized and
configured to releasably hold the tubular cannula so that the
housing resides above the support column, and wherein the needle
has an inner diameter of between about 100 .mu.m to about 750
.mu.m.
10. A surgical assembly for transferring fluid to or from a
subject, comprising: a tubular cannula having opposing proximal and
distal ends with an open axially extending lumen; an elongate
needle having opposing proximal and distal ends, wherein a length
of the needle extends through the tubular cannula lumen so that the
distal end of the needle with a tip extends out of the distal end
of the distal end of the tubular cannula to provide an exposed
needle tip; a housing comprising opposing proximal and distal ends,
wherein the housing holds the tubular cannula with the needle with
the tubular cannula and needle extending out of the distal end of
the housing, wherein the housing comprises an internal length
adjustment mechanism that is attached to one or both of the tubular
cannula or the needle and that adjusts a length between the distal
end of the tubular cannula and the exposed needle tip; wherein the
elongate needle comprises a tube that extends through the housing
and the tubular cannula and defines the exposed needle tip, and
wherein the tube extends a distance above the proximal end of the
housing: a luer connector attached to the tube above the proximal
end of the housing; and flexible tubing encasing the tube above the
housing, attached to a proximal end of the housing and the luer
connector.
11. A surgical assembly for transferring fluid to or from a
subject, comprising: a tubular cannula having opposing proximal and
distal ends with an open axially extending lumen; an elongate
needle having opposing proximal and distal ends, wherein a length
of the needle extends through the tubular cannula lumen so that the
distal end of the needle with a tip extends out of the distal end
of the distal end of the tubular cannula to provide an exposed
needle tip; and a housing comprising opposing proximal and distal
ends, wherein the housing holds the tubular cannula with the needle
with the tubular cannula and needle extending out of the distal end
of the housing, wherein the housing comprises an internal length
adjustment mechanism that is attached to one or both of the tubular
cannula or the needle and that adjusts a length between the distal
end of the tubular cannula and the exposed needle tip, wherein a
distal end of the tubular cannula is tapered so that it has a
smaller outer diameter at a tip of the tubular cannula relative to
an outer diameter rearward of the tip of the tubular cannula, and
wherein a proximal end of the tubular cannula terminates inside the
housing, wherein the elongate needle comprises a tube that extends
through the housing and the tubular cannula and defines the exposed
needle tip, and wherein the tubular cannula comprises a ceramic
material and a conformal outer polymeric sleeve, wherein the tube
is an inner tube that is bonded to an outer tube over a
longitudinally extending length inside the housing and tubular
cannula and a length that can be external to the tubular cannula
that define at least first and second co-axially disposed external
segments having different outer diameters, with a smallest sized
outer diameter of the first segment extending to the needle tip,
and wherein the outer tube comprises a conformal outer polymeric
sleeve residing at least at an interface between the distal end of
the tubular cannula and the outer tube to contact an inner surface
of the tubular cannula when retracted therein to thereby inhibit
fluid intake thereat.
12. The assembly of claim 11, wherein the outer tube terminates
inside the housing while the inner tube extends out of the housing
proximal end.
13. A surgical assembly for transferring fluid to or from a
subject, comprising: a tubular cannula having opposing proximal and
distal ends with an open axially extending lumen; an elongate
needle having opposing proximal and distal ends, wherein a length
of the needle extends through the tubular cannula lumen so that the
distal end of the needle with a tip extends out of the distal end
of the distal end of the tubular cannula to provide an exposed
needle tip; and a housing comprising opposing proximal and distal
ends, wherein the housing holds the tubular cannula with the needle
with the tubular cannula and needle extending out of the distal end
of the housing, wherein the housing comprises an internal length
adjustment mechanism that is attached to one or both of the tubular
cannula or the needle that adjusts a length between the distal end
of the tubular cannula and the exposed tip of the needle, wherein
the length adjustment mechanism comprises a flexible rack gear that
is configured to longitudinally reciprocate relative to the housing
and at least partially extend out of the housing and retract into
the housing to adjust the length, wherein the flexible rack gear
has sufficient rigidity to have a self-supporting three dimensional
shape but flexes from a straight longitudinally extending
orientation inside the housing to a curvilinear orientation when
outside the housing, and wherein the needle is coupled to and
extends through the flexible rack gear to extend out of opposing
proximal and distal ends of the flexible rack gear.
14. A surgical assembly for intrabody fluid transfer, comprising: a
tubular cannula having opposing proximal and distal ends with an
open axially extending lumen, wherein a distal end portion of the
tubular cannula is tapered so that it has a smaller outer diameter
at a tip of the tubular member relative to an outer diameter of the
tubular member closer to the housing; an elongate needle having
opposing proximal and distal ends, wherein a length of the needle
extends through the tubular cannula lumen so that the distal end of
the needle with a tip extends out of the distal end of the distal
end of the tubular cannula to provide an exposed needle tip,
wherein the exposed needle tip is configured to always remain
outside the tip of the tubular cannula; a housing comprising
opposing proximal and distal ends and a rotatable external member
or a rotatable outer wall that holds the tubular cannula with the
needle with the tubular cannula and needle extending out of the
distal end of the housing; and a length adjustment mechanism in
communication with the rotatable external member or the rotatable
outer wall that moves the needle or the tubular cannula
longitudinally to extend and retract the distal end of the needle
relative to the tubular cannula, wherein the rotatable external
member or the rotatable outer wall is configured to cooperate with
the length adjustment mechanism to adjust a length between the
distal end of the tubular cannula and the exposed tip of the
needle, wherein the length adjustment mechanism comprises a
flexible rack gear that extends in a longitudinal direction in the
housing and that has sufficient rigidity to have a self-supporting
three dimensional shape but that can flex-when outside the housing,
wherein the flexible rack gear is configured to longitudinally
reciprocate relative to the housing, and wherein the needle is
coupled to and extends through and out of opposing proximal and
distal ends of the flexible rack gear.
15. The assembly of claim 14, wherein the length adjustment
mechanism comprises a pinion gear in communication with the
rotatable external member and a longitudinally extending rack gear
that engages the pinion gear that moves the needle or the tubular
cannula longitudinally without rotation of the needle or the
tubular cannula.
16. The assembly of claim 14, wherein the needle comprises an inner
tube that extends a distance above the proximal end of the housing
and through the housing to the needle tip to define the needle tip,
the assembly further comprising a luer connector attached to the
inner tube above the proximal end of the housing.
17. A method of transferring a substance to and/or from a patient,
the method comprising: providing a housing having opposing proximal
and distal ends, the housing holding a proximal end of a tubular
cannula therein with a distal end of the tubular cannula extending
out of the housing, the tubular cannula having an axially extending
interior lumen holding an elongate needle with a length sufficient
to have a tip of the needle outside the distal end of the tubular
cannula and an upper end extending out of the proximal end of the
housing; inserting the distal end of the tubular cannula and needle
into a patient; then transferring a substance to or from a target
site through a needle lumen at the tip of the needle; adjusting a
length between the distal end of the tubular cannula and needle tip
during the transferring action; and wherein the adjusting the
length is carried out using a length adjustment mechanism
comprising a flexible rack gear fixedly attached to a sub-length of
the needle above the distal end of the housing, and wherein the
needle extends through the flexible rack gear and extends out of
opposing proximal and distal ends of the flexible rack gear.
18. The method of claim 17, wherein the needle is an infusion
needle, and wherein the transferring the substance to or from the
target site is carried out by infusing a substance.
19. The method of claim 17, wherein the target site is the brain,
and wherein the inserting, transferring and adjusting steps are
carried out while the patient is in a magnetic field of an MRI
Scanner, wherein the rack gear is held in a straight longitudinally
extending orientation when inside the housing, and wherein the
method comprises bending the rack gear up, down or side-side when
outside the housing, and inside a bore of the MRI Scanner.
20. The method of claim 17, wherein the adjusting is carried out by
extending the needle a distance out of a distal end of the tubular
cannula while the tubular cannula is held at a fixed length by
rotating an outer wall of the housing.
21. The method of claim 17, wherein the adjusting is carried out by
extending the needle a distance out of a distal end of the tubular
cannula while the tubular cannula is held at a fixed length by
rotating an outer thumbwheel to rotate a pinion gear to
longitudinally translate rack gear held at least partially inside
the housing with the rack gear fixedly attached to the needle.
22. The method of claim 17, wherein the rack gear is held in a
straight longitudinally extending orientation when inside the
housing, and wherein the method comprises bending the rack gear up,
down or side-side when exposed to the environment outside the
housing while holding a length of the needle in the rack gear
during the adjusting step.
23. A surgical assembly for intrabody fluid transfer, comprising: a
tubular cannula having opposing proximal and distal ends with an
open axially extending lumen; an elongate needle having opposing
proximal and distal ends, wherein a length of the needle extends
through the tubular cannula so that the distal end of the needle
extends out of the distal end of the tubular cannula to provide an
exposed needle tip; a housing comprising opposing proximal and
distal ends and a rotatable external member or a rotatable outer
wall that holds the tubular cannula with the tubular cannula and
needle extending out of the distal end of the housing; a length
adjustment mechanism in communication with the rotatable external
member or the rotatable outer wall that moves at least one of the
needle or the tubular cannula longitudinally to extend and retract
the distal end of the needle relative to the tubular cannula to
adjust a length between the distal end of the tubular cannula and
the exposed tip of the needle; wherein the needle is defined by an
inner tube bonded to an outer tube to define at least first and
second co-axially disposed segments having different outer
diameters, with the inner tube being longer than the outer tube and
defining the exposed needle tip; and wherein the inner tube is
directly affixed to the internal length adjustment mechanism.
24. The surgical assembly of claim 23, wherein the length
adjustment mechanism comprising a longitudinally extending flexible
rack gear with longitudinally spaced apart and laterally extending
gear teeth extending across an entire width dimension of the
flexible rack gear, and wherein the inner tube extends
longitudinally through a medial portion of the body of the rack
gear and extends out of opposing proximal and distal ends of the
flexible rack gear.
Description
FIELD OF THE INVENTION
The present invention relates generally to medical devices and
systems and, more particularly, to devices and systems for
delivering and/or withdrawing substances in vivo.
BACKGROUND
Various therapeutic and diagnostic procedures require that a
substance be delivered (e.g., infused) into a prescribed region of
a patient, such as to an intrabody target using a delivery device.
It may be important or critical that the substance be delivered
with accuracy to the target region in the patient and without undue
trauma to the patient.
SUMMARY
It should be appreciated that this Summary is provided to introduce
a selection of concepts in a simplified form, the concepts being
further described below in the Detailed Description. This Summary
is not intended to identify key features or essential features of
this disclosure, nor is it intended to limit the scope of the
invention.
Embodiments of the invention are directed to intrabody fluid
transfer assemblies with adjustable exposed tubular cannula to
needle tip length, related systems and methods.
Embodiments of the invention are directed to a surgical device for
transferring fluid to or from a subject. The device includes a
tubular cannula (which may be referred to as an elongate guide
cannula) having opposing proximal and distal ends with an open
axially extending lumen. The device also includes an elongate
needle (which can also be referred to as a "capillary" or
"capillary tube") having opposing proximal and distal ends. The
elongate needle is configured to extend through (typically slidably
insertable into) the tubular cannula lumen so that the distal end
of the needle extends a distance out of the distal end of the
tubular cannula. The device also includes a length adjustment
housing for positional adjustment of length between the distal end
of the tubular cannula and the exposed tip of the needle.
The tubular cannula and/or needle can be held in the housing to be
retracted and extended from the housing.
The length adjustment housing can reside external of a patient when
the distal end portion of the tubular cannula and needle are in the
patient.
The housing can rotate in a defined direction to extend at least
one of the needle or the cannula.
A portion of the needle resides in and/or is attached to or
attachable to a length of flexible tubing. The elongate needle can
be formed of fused silica glass. The distal end of the needle can
have a stepped configuration with a first segment having a first
outer diameter that merges into a second end segment having a
second smaller outer diameter, the second segment having a length
that extends to a tip of the needle.
The needle may comprise an inner capillary member and an outer
capillary member of a larger diameter than the inner capillary tube
but a smaller diameter than the cannula tube.
The outer capillary tube can comprise a shrink fit sleeve to
sealably engage the inner wall of the lumen of the tubular
cannula.
The distance that the needle tip extends out of the distal end of
the tubular cannula is between about 2 mm to about 30 mm and this
length can be extended or retracted relative to the tubular cannula
when the tubular cannula and needle tip are in the body of a
patient (i.e., a brain).
The tubular cannula can be formed of and/or include a ceramic
material.
The tubular cannula can have an outer polymeric coating and/or
sleeve.
The distal end of the tubular cannula can be tapered so that it has
a smaller outer diameter at a tip relative to an outer diameter of
the tubular cannula more proximal or rearward of the tapered distal
end.
The elongate needle can be an infusate needle that has a stepped
distal end configuration and is integrally attached to the flexible
tubing as a subassembly.
The needle and tubular cannula can be MRI compatible for use in an
MRI guided procedure.
The intrabody devices can be particularly suitable for
withdrawing/introducing fluid from/into the ventricular brain.
The tubular cannula can be formed of or include a ceramic
material.
The tubular cannula can have an outer polymeric coating and/or
sleeve.
The distal end of the tubular cannula can be tapered so that it has
a smaller outer diameter at a tip relative to an outer diameter of
the tubular cannula at a more medial or proximal portion and/or
rearward of the tapered distal end.
The tubular cannula can be formed of and/or include a ceramic
material.
The tubular cannula and the outer capillary can each comprise a
conformal outer polymeric sleeve.
The distal end portion of the needle that extends out of the
tubular cannula can have at least first and second co-axially
disposed segments having different outer diameters, with a smallest
sized outer diameter of the first segment extending to a tip
thereof.
The tubular cannula can have an exterior surface on a distal end
portion thereof that tapers down in size to a tip thereof to define
a third coaxially disposed stepped segment that resides a distance
rearward of the second segment and has a larger outer diameter than
both the first and second co-axially disposed segments.
The needle can have a fused glass silica body.
An outer surface of the tubular cannula can have a size and
geometry adapted for use with a stereotactic frame.
The needle can have an inner diameter of between about 100 .mu.m to
about 750 .mu.m.
The first smallest outer diameter segment can have a longitudinal
length of between about 1 mm to about 10 mm. The second segment can
have a longitudinal length of between about 2 mm to about 20 mm.
The distal tip of the guide cannula can reside a distance between 3
mm to about 30 mm from a distal tip of the needle.
Yet other embodiments are directed to methods of transferring a
substance to and/or from a patient, the methods include: providing
a tubular cannula with an axially extending interior lumen and a
needle having an internal lumen with a distal end of the needle
extending out of the tubular cannula at a target site; then
transferring the substance to or from the target site through the
needle lumen.
The needle can be an infusion needle. The transferring the
substance to or from the target site can be carried out by infusing
a substance into target tissue such as into the brain or into the
heart, for example.
It is noted that aspects of the invention described with respect to
one embodiment may be incorporated in a different embodiment
although not specifically described relative thereto. That is, all
embodiments and/or features of any embodiment can be combined in
any way and/or combination. Applicant reserves the right to change
any originally filed claim or file any new claim accordingly,
including the right to be able to amend any originally filed claim
to depend from and/or incorporate any feature of any other claim
although not originally claimed in that manner. These and other
objects and/or aspects of the present invention are explained in
detail below.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1A is a side view of an exemplary intrabody fluid transfer
assembly shown in an exemplary first position according to
embodiments of the present invention.
FIG. 1B is a side view of the exemplary intrabody fluid transfer
assembly shown in an exemplary second position, with the needle tip
further away from a distal end of the tubular cannula than in the
first position, according to embodiments of the present
invention.
FIG. 2A is a side view of the assembly shown in FIG. 1A in the
first position.
FIG. 2B is a section view taken along lines 2B-2B in FIG. 2A
according to embodiments of the present invention.
FIG. 3A is a side view of the assembly shown in FIG. 1B in the
second position.
FIG. 3B is a section view taken along lines 3B-3B in FIG. 3A
according to embodiments of the present invention.
FIG. 4A is a side view of some components of the assembly shown in
FIG. 1B.
FIG. 4B is a partial exploded view of the components shown in FIG.
4A according to embodiments of the present invention.
FIG. 5A is a side view of the assembly shown in FIG. 1B in the
second position according to embodiments of the present
invention.
FIG. 5B is a section view taken along lines 5B-5B in FIG. 5A of the
assembly shown in FIG. 5A.
FIG. 5C is a section view taken along lines 5C-5C in FIG. 5A.
FIG. 6 is an enlarged section view of components of the assembly
shown in FIG. 5A according to some embodiments of the present
invention.
FIG. 7 is a greatly enlarged side perspective view of a housing of
an assembly with a length adjustment mechanism/mechanism according
to embodiments of the present invention.
FIG. 8A is a side perspective view of another embodiment of an
intrabody fluid transfer assembly according to embodiments of the
present invention.
FIG. 8B is a side perspective view of the assembly shown in FIG. 8A
but illustrating the exposed needle tip further extended according
to embodiments of the present invention.
FIG. 9A is a greatly enlarged partially transparent view of the
housing assembly shown in FIGS. 8A and 8B.
FIG. 9B is a greatly enlarged partially transparent view of another
embodiment of a housing for the assembly shown in FIGS. 8A and 8B
according to embodiments of the present invention.
FIG. 9C is a side partially exposed view of the infusion assembly
shown in FIG. 9B illustrating a needle tip to tubular cannula
retracted configuration with the gear outside the housing according
to embodiments of the present invention.
FIG. 9D is a side partially exposed view of the infusion assembly
shown in FIG. 9C illustrating a needle tip to tubular cannula
extended configuration with the gear inside the housing according
to embodiments of the present invention.
FIG. 9E is a top view with the housing shown partially transparent
of the transfer assembly shown in FIG. 9C.
FIG. 9F is a section view taken along line 9F-9F in FIG. 9E.
FIGS. 9G, 9H and 9I illustrate exemplary attachment regions of
various components of the fluid transfer assembly shown in FIGS. 9D
and 9E according to embodiments of the present invention.
FIG. 10A is a side perspective view of another embodiment of an
intrabody fluid transfer assembly according to embodiments of the
present invention.
FIG. 10B is a side perspective view of the assembly shown in FIG.
10A but illustrating the exposed needle tip further extended
according to embodiments of the present invention.
FIG. 11A is a side perspective, partially exploded view of the
intrabody fluid transfer assembly shown in FIG. 10A.
FIG. 11B is a greatly enlarged partial assembly view of the portion
of the intrabody fluid transfer assembly shown in FIG. 11A.
FIG. 12A is a side partially exposed view of the infusion assembly
shown in FIG. 10A illustrating a needle tip to tubular cannula
retracted configuration with the gear outside the housing according
to embodiments of the present invention.
FIG. 12B is a side partially exposed view of the infusion assembly
shown in FIG. 12A illustrating a needle tip to tubular cannula
extended configuration with the gear inside the housing according
to embodiments of the present invention.
FIG. 12C is a top view with the housing shown partially transparent
of the transfer assembly shown in FIG. 9C.
FIG. 12D is a section view taken along line 12D-12D in FIG.
12C.
FIGS. 12E and 12F illustrate exemplary attachment regions of
various components of the fluid transfer assembly shown in FIGS.
12A-12D according to embodiments of the present invention.
FIG. 13 is a top view of an exemplary intrabody fluid transfer
assembly according to embodiments of the present invention.
FIG. 14 is a schematic illustration of an MRI-guided interventional
system in which embodiments of the present invention may be
utilized.
FIG. 15 is a sectional view of the trajectory guide of the
MRI-guided system of FIG. 14 with an exemplary needle and surgical
cannula for transferring a substance (e.g., an infusate, etc.) to
an intrabody target region of a patient.
FIG. 16 is a flow chart of exemplary actions that can be carried
out according to embodiments of the present invention.
DETAILED DESCRIPTION
The present invention now is described more fully hereinafter with
reference to the accompanying drawings, in which some embodiments
of the invention are shown. This invention may, however, be
embodied in many different forms and should not be construed as
limited to the embodiments set forth herein; rather, these
embodiments are provided so that this disclosure will be thorough
and complete, and will fully convey the scope of the invention to
those skilled in the art.
Like numbers refer to like elements throughout. In the figures, the
thickness of certain lines, layers, components, elements or
features may be exaggerated for clarity. The terms "FIG." and
"Fig." are used interchangeably with the word "Figure" in the
specification and/or figures.
The terminology used herein is for the purpose of describing
particular embodiments only and is not intended to be limiting of
the invention. As used herein, the singular forms "a", "an" and
"the" are intended to include the plural forms as well, unless the
context clearly indicates otherwise. It will be further understood
that the terms "comprises" and/or "comprising," when used in this
specification, specify the presence of stated features, steps,
operations, elements, and/or components, but do not preclude the
presence or addition of one or more other features, steps,
operations, elements, components, and/or groups thereof. As used
herein, the term "and/or" includes any and all combinations of one
or more of the associated listed items.
Unless otherwise defined, all terms (including technical and
scientific terms) used herein have the same meaning as commonly
understood by one of ordinary skill in the art to which this
invention belongs. It will be further understood that terms, such
as those defined in commonly used dictionaries, should be
interpreted as having a meaning that is consistent with their
meaning in the context of the specification and relevant art and
should not be interpreted in an idealized or overly formal sense
unless expressly so defined herein. Well-known functions or
constructions may not be described in detail for brevity and/or
clarity.
It will be understood that when an element is referred to as being
"on", "attached" to, "connected" to, "coupled" with, "contacting",
etc., another element, it can be directly on, attached to,
connected to, coupled with or contacting the other element or
intervening elements may also be present. In contrast, when an
element is referred to as being, for example, "directly on",
"directly attached" to, "directly connected" to, "directly coupled"
with or "directly contacting" another element, there are no
intervening elements present. It will also be appreciated by those
of skill in the art that references to a structure or feature that
is disposed "adjacent" another feature may have portions that
overlap or underlie the adjacent feature.
Spatially relative terms, such as "under," "below," "lower,"
"over," "upper" and the like, may be used herein for ease of
description to describe one element or feature's relationship to
another element(s) or feature(s) as illustrated in the figures. It
will be understood that the spatially relative terms are intended
to encompass different orientations of the device in use or
operation in addition to the orientation depicted in the figures.
For example, if the device in the figures is inverted, elements
described as "under" or "beneath" other elements or features would
then be oriented "over" the other elements or features. Thus, the
exemplary term "under" can encompass both an orientation of "over"
and "under". The device may be otherwise oriented (rotated 90
degrees or at other orientations) and the spatially relative
descriptors used herein interpreted accordingly. Similarly, the
terms "upwardly," "downwardly," "vertical," "horizontal" and the
like are used herein for the purpose of explanation only unless
specifically indicated otherwise.
The term "about," as used herein with respect to a value or number,
means that the value or number can vary by +/-twenty percent
(20%).
The term "monolithic" means that the component (e.g., needle) is
formed of a single uniform material.
The term "MRI visible" means that a device is visible, directly or
indirectly, in an MRI image. The visibility may be indicated by the
increased SNR of the MRI signal proximate to the device (the device
can act as an MRI receive antenna to collect signal from local
tissue) and/or that the device actually generates MRI signal
itself, such as via suitable hydro-based coatings and/or fluid
(typically aqueous solutions) filled channels or lumens.
The term "MRI compatible" means that a device is safe for use in an
MRI environment and/or can operate as intended in an MRI
environment without generating MR signal artifacts, and, as such,
if residing within the high-field strength region of the magnetic
field, is typically made of a non-ferromagnetic MRI compatible
material(s) suitable to reside and/or operate in a high magnetic
field environment.
The term "high-magnetic field" refers to field strengths above
about 0.5T (Tesla), typically above 1.0T, and more typically
between about 1.5T and 10T.
The term "near real time" refers to both low latency and high frame
rate. Latency is generally measured as the time from when an event
occurs to display of the event (total processing time). For
tracking, the frame rate can range from between about 100 fps to
the imaging frame rate. In some embodiments, the tracking is
updated at the imaging frame rate. For near "real-time" imaging,
the frame rate is typically between about 1 fps to about 20 fps,
and in some embodiments, between about 3 fps to about 7 fps. The
low latency required to be considered "near real time" is generally
less than or equal to about 1 second. In some embodiments, the
latency for tracking information is about 0.01 s, and typically
between about 0.25-0.5 s when interleaved with imaging data. Thus,
with respect to tracking, visualizations with the location,
orientation and/or configuration of a known intrabody device can be
updated with low latency between about 1 fps to about 100 fps. With
respect to imaging, visualizations using near real time MR image
data can be presented with a low latency, typically within between
about 0.01 ms to less than about 1 second, and with a frame rate
that is typically between about 1-20 fps. Together, the system can
use the tracking signal and image signal data to dynamically
present anatomy and one or more intrabody devices in the
visualization in near real-time. In some embodiments, the tracking
signal data is obtained and the associated spatial coordinates are
determined while the MR image data is obtained and the resultant
visualization(s) with the intrabody device (e.g., stylet) and the
near RT MR image(s) are generated.
The term "sterile," as used herein, means that a device, kit,
and/or packaging meets or exceeds medical/surgical cleanliness
guidelines, and typically is free from live bacteria or other
microorganisms.
Embodiments of the present invention can be utilized with various
diagnostic or interventional devices and/or therapies to any
desired internal region of an object using any suitable imaging
modality, typically an MRI and/or in an MRI scanner or MRI
interventional suite. However, CT or other imaging modalities may
be used. The object can be any object, and may be particularly
suitable for animal and/or human subjects for e.g., animal studies
and/or veterinarian or human treatments. Some embodiments deliver
therapies to the spine. Some embodiments deliver therapies to treat
or stimulate a desired region of the sympathetic nerve chain. Other
uses, inside or outside the brain, nervous system or spinal cord,
include stem cell placement, gene therapy or drug delivery for
treating physiological conditions, chemotherapy, drugs including
replicating therapy drugs. Some embodiments can be used to treat
tumors.
The term "substance," as used herein, refers to a liquid for
treating or facilitating diagnosis of a condition and can include
bions, stem cells or other target cells to site-specific regions in
the body, such as neurological, nerves or other target sites and
the like. In some embodiments, stem cells and/or other rebuilding
cells or products can be delivered into spine, brain or cardiac
tissue, such as a heart wall via a minimally invasive MRI guided
procedure, while the heart is beating (i.e., not requiring a
non-beating heart with the patient on a heart-lung machine).
Examples of known stimulation treatments and/or target body regions
are described in U.S. Pat. Nos. 6,708,064; 6,438,423; 6,356,786;
6,526,318; 6,405,079; 6,167,311; 6,539,263; 6,609,030 and
6,050,992, the contents of which are hereby incorporated by
reference as if recited in full herein.
The term "infusion" and derivatives thereof refers to the delivery
of a substance (which can be a single substance or a mixture) at a
relatively slow rate so that the substance can infuse about a
target region. Thus, the term "infusate" refers to a substance so
delivered.
Embodiments of the present invention will now be described in
further detail below with reference to the figures. FIGS. 1A and 1B
illustrate an exemplary intrabody fluid transfer assembly 10 with a
tubular cannula 20, a needle 30 and a housing 40 with a length
adjustment mechanism 50 attached (directly or indirectly) to one or
both of the tubular cannula 20 and needle 30 to be able to extend
and retract one or both relative to the distal end 40d of the
housing. The term "needle" refers to a relatively small device with
an open lumen (30l, FIG. 5C) extending to its tip 30t to release or
intake fluid.
The tubular cannula 20 can comprise a different material than the
needle 30. Where the needle 30 comprises inner and outer capillary
tubes 31, 33, the outer capillary tube 33 can be shorter than the
inner capillary tube 31 and may terminate inside the housing 40. By
way of example only, the tubular cannula 20 can be a ceramic tube
that has increased rigidity relative to the needle and the needle
30 can be formed of fused silica.
The length adjustment mechanism 50 is configured to adjust a
distance or length D.sub.1 between the distal end 20d of the
tubular cannula and the exposed tip 30t of the needle. The length
adjustment mechanism 50 can be configured to provide a maximal
stroke length of between 0.5 inches and 3 inches, more typically
between about 0.75 inches to about 1 inch (2.5 cm) such as about
0.79 inches. The length adjustment can be carried out in vivo while
the housing remains external of a patient with the distal end of
the cannula 20d and needle tip 30t in the body of the patient.
The distal end of the housing 40d can reside at a distance that is
between 4-10 inches from the needle tip 30t, more typically between
4 and 5 inches. This length can remain fixed in some
embodiments.
The needle 30 may comprise an inner capillary tube 31 with a length
sufficient to define the tip 30t and may have an outer capillary
tube 33 that resides a distance rearward from the tip 30t to form
at least one stepped distal end portion 30s (so that the needle 30
merges from a larger diameter to a smaller diameter at a distal end
portion thereof, toward the tip 30t) of the needle 30. This stepped
portion can define a surface that is orthogonal to the
cannula/needle axis.
As shown in FIGS. 1A and 1B, the tubular cannula 20 can have
opposing proximal and distal ends 20p, 20d, respectively. The
tubular cannula 20 can have an external exposed stepped and/or
tapered segment 21 (the outer diameter becoming smaller in a
direction of the needle tip 30t). The distance between the distal
end of the tubular cannula 20d and the needle tip 30t can be
adjusted by a user to position the tapered segment 21 closer or
further away from the needle tip 30t.
As shown in FIGS. 1A, 2A and 2B, for example, in a first
configuration, the needle tip 30t resides at a short distance
"D.sub.1" from the distal end of the cannula 20d while in FIG. 1B,
in a second configuration, the distal end of the cannula 20d
resides at a longer distance D.sub.2 from the needle tip 30t.
D.sub.2 can be between about 0.5 inches and about 3 inches, more
typically between about 0.5 inches and about 1.1 inch. D.sub.1 can
be between about 1 mm to about 50 mm, typically between 1 mm and 10
mm, and in some embodiments between about 2 mm to about 4 mm, such
as about 3 mm.
The needle tip 30t may be configured to reside at a fixed extended
length from the distal end 20d of the housing which may be between
about 4 and 6 inches, more typically between about 4.8 and about 5
inches, in some particular embodiments.
In some particular embodiments, the distal end of the tubular
cannula 20d can reside at a length L.sub.2 that is about 4.7 inches
in a fully extended position (FIG. 1A) and at about 3.93 inches in
a fully retracted position (FIG. 1B). However, other stroke
distances and extended and retracted lengths may be used.
Referring to FIG. 1B, the distal end portion of the needle 30d can
have at least one stepped segment 30s that can have an increased
outer diameter relative to the tip 30t. The stepped segment 30s can
reside in the distal end of the cannula 20d in the configuration
shown in FIGS. 1A, 2A and 2B.
The stepped segment 30s can reside a fixed length D1 from the tip
30t. D.sub.1 can be, for example, between about 1 mm to about 50
mm, typically between 1 mm and 10 mm, and in some embodiments
between about 2 mm to about 4 mm, such as about 3 mm. In the
configuration shown in FIG. 1B, for example, the needle 30 can have
an exposed length L.sub.3 that extends rearward from the stepped
segment 30s with the increased outer diameter out of the distal end
of the tubular cannula 20d. L.sub.3 can be longer than D.sub.1 and
can be between about 2 mm and 20 mm. The distal end portion of the
needle 30d may include more than two co-axially aligned
(concentric) stepped segments 30s.
The tubular cannula 20 can have a length L.sub.2 that extends out
of the housing 40 that varies to provide the positional adjustment
relative to the tip. In other embodiments, the tubular cannula 20
can remain fixed in position in the housing 40 and the needle 30
can be extended and retracted relative to the housing 40. In yet
other embodiments, the tubular cannula 20 and the needle 30 can
each be extendable and retractable out of the distal end of the
housing 40d.
The length D.sub.2 of the distal end portion of the needle 30
outside the cannula 20 during delivery can be between about 3 mm to
30 mm. These lengths can be selected to inhibit reflux and/or
provide a desired delivery path during infusion.
The needle 30 can have a stepped distal end portion that cooperates
with the cannula 20 to form co-axially disposed step segments (the
orthogonally extending end face at the distal end 20d of the
cannula, and the stepped segment 30s of the needle. There can be
three different outer diameters that are longitudinally separated
with steps on one or more of end faces S.sub.1, S.sub.2, S.sub.3
(FIG. 4A). One or some of the steps S.sub.1, S.sub.2, S.sub.3 can
serve to reduce or prevent reflux of the delivered substance. The
end face at taper segment S.sub.3 can be a conical face rather than
an orthogonal end face provided at S.sub.1 and S.sub.2 (orthogonal
to the axial direction of the needle axial direction and the
tubular cannula axial direction).
According to some embodiments, the inner diameter of the needle 30
is in the range of from about 10 .mu.m to 1 mm and, in some
particular embodiments, is between about 100 .mu.m to about 750
.mu.m, such as about 200 .mu.m. According to some embodiments, the
outer diameter at the tip 30t is in the range of from about 75
.mu.m to 1.08 mm and, in some embodiments, is about 360 .mu.m.
In some embodiments, as shown in FIGS. 1A and 1B, for example, an
outer wall 40w of the housing 40 can be (manually or
electro-mechanically) rotated in a first direction (indicated by
the arrow with the letter "R") to retract the length adjustment
mechanism 50 in the housing 40, which, in turn, exposes a larger
length of the distal end of the needle 30 (FIGS. 1B, 3A, 3B). The
rotation can be in either direction for the retraction and is
typically manually carried out. The rotation of the outer wall of
the housing 40w can retract the tubular cannula 20 and/or extend
the needle 30.
The rotatable outer wall 40w can be the entire outer wall or a
portion of the outerwall. The rotatable outer wall 40w can be
between about 1 about 6 inches long and may have a small diameter,
greater than the diameter of the outer wall of the tubular cannula
20 and less than about 0.3 inches, in some embodiments. The
rotatable outer wall 40w can be cylindrical.
According to some embodiments, at least part of an exposed length
of the tubular cannula 20 has an outer surface comprising a
polymeric support sleeve 23 (FIG. 3A) which can comprise a shrink
tube and may have a thickness in the range of from about 40 .mu.m
to about 60 .mu.m.
While different sizes may be appropriate for different uses, the
tubular cannula 20 can, in some embodiments, have an outer diameter
that is between about 0.2 inches and 0.015 inches, such as, in some
particular embodiments about 0.061 inches and an inner diameter
that is between 0.10 inches and 0.001 inches, such as, in some
particular embodiments, about 0.029 inches. The tubular cannula 20
can have a lower portion with a smaller outer diameter than an
upper or proximal portion or may have a constant outer diameter
over its length to the tapered segment 21.
The needle 30 can be fused silica and may also include an outer
wall covered by a sleeve 35 which can comprise a shrink tube or
other polymeric sleeve or coating, typically starting at the
stepped segment 30s and extending a length over the outer capillary
33 as shown, for example in FIGS. 3A and 5C, to facilitate a
suitably fluid-tight interface at the distal end of the tubular
guide cannula 20d to inhibit or reduce fluid entry into this
interface/space during delivery or intake. The sleeve 35 can be
polyester and can have a thickness that is between about 0.00125
inches and 0.00150 inches (0.032-0.038 mm), in some
embodiments.
As shown in FIGS. 1A, 1B, 2A and 2B, for example, the assembly 10
can have a connector 60, such as a female or male luer connector
(shown as female) that resides a distance away from the housing 40,
typically a length that positions an upper/outer end 60e a distance
between 3-20 inches away from the proximal end of the housing 40p,
more typically between about 6-10 inches. The needle 30 (typically
only the inner capillary 31 without the outer capillary 33, where
used) can extend through the housing 40 to an internal portion of
the connector 60 to be in fluid communication with the connector
60. Tubing 65, such as PVC tubing, can extend between a proximal
end of the housing 40p to the connector 60 about the needle 30. The
needle 30 can have a total length between the connector 60 and tip
30t that can be at between about 10-20 inches, typically about
15.65 inches.
Referring to FIGS. 3A, 3B, 4A and 4B, in some embodiments, the
length adjustment mechanism 50 can comprise a longitudinally
extending screw 50s that resides in the housing 40 and that can
controllably translate in an axial direction to provide the
positional adjustment of the distance between the distal end of the
tubular cannula 20d and the needle tip 30t. However, it is
contemplated that other length adjustment mechanisms may be used,
such as, for example, gears such as worm gears, planetary gears,
rack and pinions and the like, cams, ratchets, frictional slides,
and/or linkages.
The housing 40 can include an internal, longitudinally extending
threaded segment 40t that engages threads 50t of the length
adjustment screw member 50s. Thus, the outer wall of the housing
40w can rotate and act as a nut to be able to threadably engage and
rotate the screw 50s. The screw 50s can have a relatively fine
pitch configuration, such as a thread configuration of 3-48 (48
threads per inch). The screw 50s can be of brass for MRI
compatibility, but other materials may be used as well as other
pitch configurations.
In the embodiment shown in FIGS. 2B, 3A and 3B, for example, an
outer wall 20w of the tubular cannula can be fixably attached to
the screw 50s, typically bonded, so that the threads form the
outerwall of a portion of the tubular cannula 20w (typically a
proximal end portion of the cannula 20p) but other fixation
configurations may be used.
In some embodiments, the outerwall of the tubular cannula 20w can
have the thread pattern formed directly therein. In some
embodiments, the needle 30 can be fixably attached to the screw 50s
(not shown) to allow length adjustment. In some embodiments, more
than one internal screw can be used, one attached to the tubular
cannula 20 and one attached to the needle 30 and separate portions
of the housing 40 or members held by the housing 40 can be used to
selectively move each of the cannula 20 and the needle 30 to
provide adjustable exposed lengths (not shown).
Referring to FIGS. 2B, 3B, 4A and 4B, the housing 40 can have an
axially extending lumen 41 and an inner, longitudinally extending
wall or surface 41s extending about the lumen, at least a
longitudinally extending segment of which can be threaded 40t,
typically for a sub-length of the overall length of the housing 40
residing between the proximal and distal ends of the housing. The
threads 40t can be configured to define hard stops at fully
retracted and fully extended positions which can be associated with
a short linear distance of between about 0.5 inches and 1.25
inches.
The housing 40 can be manually held by a finger(s) or hand of a
user during use to allow for manual rotation of the housing outer
wall 40w or other user input to the screw 50s or may be supported
by a support frame or member (not shown).
The device 10 may also include a handle body 70 held in the housing
40 that has a longitudinally extending slot 72 that allows a
laterally extending pin 55 attached to the screw 50s and/or tubular
cannula 20 in the embodiment shown, to move therein. The handle
body 70 and/or outer surface of the housing 40 thereat can include
visual indicia of position 77 such as symmetrically spaced apart
marks and/or a graduated scale, for example. The pin 55 can include
a color-contrast segment 55c (FIG. 7) that extends across the slot
72 at or above an outer surface of a wall at the slot 72 to align
with aligned spaced apart visual indicia marks 77 across the slot
to facilitate visual recognition of the extended or retracted
length position (distance between the needle tip 30t and distal end
of the guide cannula 20d).
The handle body 70 can have an elongate cylindrical shape with an
axially extending interior cavity surrounding the tubular cannula
20 and may be encased in the housing 40. The housing 40 can have a
transparent or visually transmissive outer wall 40w. The handle
body 70 can have a proximal end 70p that resides in the housing 40,
typically abutting a ledge forming a pocket 40k (FIGS. 2B, 3B) and
a larger distal end 70d that defines the distal end of the housing
40d allowing the tubular cannula 20 to extend therethrough when
assembled (FIGS. 2A, 2B, 3A and 3B, for example).
In some embodiments, the handle body 70 can provide some or all of
the internal threads 40t that cooperate with the screw 50s. In some
embodiments, the handle body 70 is devoid of internal threads and
merely allows the tubular cannula 20 and/or threaded member 50s to
longitudinally (slidably) translate closely spaced thereto in the
cavity of the handle body 70.
The handle body 70 can be attached to an innerwall 40i of the
housing (FIGS. 2B, 3B) and/or may be held in the pocket 40k (FIG.
2B) extending between a medial to a distal end portion of the
housing 40. A support member 44 can be affixed to a distal end of
the housing 40d to lock the handle body 70 in position while
allowing the lower end portion of the tubular cannula 20 to extend
out from the housing. The handle body 70 can be static and can
allow the pin 55 to move up and down along the slot 72 to inhibit
rotation of the handle body 70 during rotation of the screw
50s.
A proximal support member 47 can be attached at a top of the
housing 40. The proximal support member 47 can have a small rigid
tubular projection that attaches to the flex tubing 65 that extends
a distance such as between 1-10 inches, typically about 3-8 inches,
between the support member 47 and connector 60. In other
embodiments, the connector 60 can be directly attached to the end
member 47 and/or housing 40 (not shown).
The support end members 44, 47 and the handle body 70 can all
remain stationary during use as the outerwall 40w is rotated. The
end support members 44, 47 can capture the housing 40 therebetween,
which can rotate in response to a user's direction clockwise and or
counterclockwise to cause the translation and adjust the needle tip
30t to the distal end of the cannula 20 length. Thus, the wall of
the housing 40 and the screw 50s can rotate to move the tubular
cannula 20 (as shown) and/or the needle 30 (not shown).
The outer wall of the housing 40w can include an elongate bracket
42 (FIGS. 2B, 4B) that is adjacent but laterally spaced apart from
the rotatable outer wall 40w and can be attached to each end member
44, 47.
Referring now to FIGS. 3A, 3B, 5A, 5B, 5C and 6, for example, and
in some exemplary embodiments, the needle 30 can comprise the inner
capillary tube 31 and the outer capillary tube 33 and the tubes 31,
33 can be fixably attached, typically bonded together, so that they
have a fixed configuration relative to each other such that the
inner capillary 31 extends about 3 mm from the distal end of the
outer capillary 33. An external polymeric conformable tube (i.e., a
polyester shrink wrap tube) 35 can reside over the outer capillary
tube 33 at least for a distance that can be external of the housing
and/or distal end of the cannula 20d.
The length adjustment mechanism 50 can be fixably attached
(typically bonded) to the needle 30 or the tubular cannula 20. The
external polymeric conformable tube (i.e., a shrink wrap tube) 23
can reside over an exposed length of the cannula 20, typically over
a distal end thereof 20d with the tapered end 21. The pin 55 can
also be attached (i.e., bonded) to the screw 50s and/or tubular
cannula 20. The screw 50s can be affixed to a proximal end portion
of the tubular cannula 20p, typically for a length between about
0.5 inches and 2 inches, more typically between about 0.75 inches
and 1.1 inches, in some embodiments. The tubular cannula 20 and
outer capillary 33 can terminate inside the housing 40, typically
adjacent the proximal end 70p of the handle body). The upper end
support 47 can be fixably attached (i.e., bonded) to the housing
proximal end 40p and the support tube 65 can be affixed to the end
support 47. The end support member 44 can be affixed (i.e., bonded)
to the distal end portion of the handle body 70d. The support tube
65 with inner capillary tube 31 can also be fixably attached (i.e.,
bonded) to the connector 60.
Referring to FIGS. 8A, 8B, 9A and 9B, the assembly 10' can have a
length adjustment mechanism 50' that can include an external user
interface member 50i (shown as a thumbwheel) that extends laterally
outward a distance beyond the housing 40 that is attached to the
housing 40. As shown, this mechanism 50' includes a pinion gear 151
that engages a longitudinally extending internal rack gear 150
inside the housing 40. FIG. 8A illustrates a retracted
configuration of the needle tip 30t and FIG. 8B illustrates an
exemplary extended position of the needle tip 30t relative to the
distal end 20d of the tubular cannula 20. Thus, the outer wall 40w
is not required to rotate. The rack gear 150 can be bonded or
otherwise fixedly attached to the needle 30 (typically the inner
capillary tube 31). The tubular cannula 20 can be rigid and held by
a distal end 40d of the housing 40 to have a fixed length (i.e., it
does not move).
Referring to FIGS. 9A and 9B, the rack gear 150 can have
longitudinally extending gear teeth 150g on one side that face the
pinion gear 151 and can have a series of longitudinally spaced
apart recesses 150r (shown as arcuate recesses) along a length of
the other opposing longitudinally extending side that can slidably
engage a pin 144 extending laterally inside a cavity 140c provided
by mating first and second housing members 40a, 40b. The housing
members 40a, 40b can include a longitudinally extending slot 141
that cooperate to hold the rack gear 150 in position. The rack gear
150 can pull the needle 30 up and down relative to the housing and
the tubular cannula 20 to adjust the position of the exposed needle
tip 30t. The rack gear 150 can optionally include alignment tabs
153 that can engage alignment slots 145 in the inner wall of one or
both of the housing members 40a, 40b.
The rack gear 150 can be flexible (meaning it can be compressed or
bent side to side or front to back using a small bending force or
pressure). The rack gear 150 can have sufficient rigidity to have a
self-supporting three dimensional shape but can flex in any
direction when outside the housing 40. FIG. 9C illustrates by the
arrows above the gear with an exemplary flex axis A, that the gear
150 can bend side to side relative to the housing 40 when extended
from the housing 40 with the needle 30 (typically inner capillary
31) extending out each longitudinally extending end thereof. The
rack gear 150 can comprise a polymer such as a nylon or
polycarbonate and may be injection molded.
As shown by the broken line extension 30f of the needle in FIG. 8A,
the extension of the needle 30 can be flexible and can loop and/or
bend when held loose and not supported by a support member. The
pinion gear 151 may also be flexible or may comprise a different
material than the rack gear and may be rigid, semi-rigid or be less
flexible than the rack gear 150.
FIGS. 8A, 8B and 9A illustrate that the housing 40 can curve (be
arcuate, concave or convex) typically having a straight segment
that can optionally curve above the external length adjustment
mechanism 50' and/or pinion gear 151. The internal slots 141 can
direct the rack gear 150 to take on a conformal curved shape when
it travels into this space.
FIG. 9B shows that the housing 40 can be shorter and straight,
relative to the configuration shown in FIG. 9A, for example.
FIGS. 9C, 9F and 9E illustrate a needle tip 30t to distal end of
tubular cannula 20 in a retracted configuration (the needle tip 30t
is closer to the distal end of the tubular cannula 20 than in an
extended configuration/position) with the gear 150 outside the
housing 40 according to embodiments of the present invention. The
gear 150 can be exposed but typically extends and retracts in
adjacent tubing 240 (FIG. 13) with the inner capillary 31 and/or
other needle 30 and/or capillary member. The needle 30 can travel
longitudinally maximally a stroke distance between extended and
retracted positions between 1-6 inches, such as between 2-4 inches,
while the tubular cannula 20 is fixed in its length relative to the
needle and/or housing 40.
FIG. 9D illustrates a needle tip 30t to distal end 20d of the
tubular cannula in an extended configuration with the gear 150
totally inside the housing 40 and its distal end closer to the
bottom member 146b than in the position shown in FIG. 9E, for
example.
FIGS. 9C-9F also illustrate that the fluid transfer assembly 10'
can include a tube 65 that encloses the needle 30 and that extends
above the housing 40 to a connector 60, typically a luer connector
as discussed above.
FIGS. 9E and 9F illustrate that the rotatable user interface member
50i can include a drive shaft 152 that is attached to a center of
the pinion 151 so that rotation of the member 50i rotates the
pinion 151, which moves the rack gear 150 holding the needle
30.
FIGS. 9G, 911 and 9I illustrate exemplary attachment configurations
of components of the assembly 10'. The pin 153 can be affixed,
typically bonded, to the gear 150. The proximal end of the tubular
cannula 20p can be bonded or otherwise affixed to the distal end of
the housing 40d. The gear 150 can be affixed, typically bonded, to
the needle 30, typically the inner capillary 31. The needle 30 can
extend through and out each end of the gear 150, typically via a
longitudinally extending medial slot, channel or aperture in the
gear 150. The housing members 40a, 40b can be matably attached,
typically bonded, with the gear 150 and needle 30, typically the
inner capillary 31, therein.
The tube 65, attached to the screw 50s and the needle 30 (i.e.,
inner capillary 31) can form a unitary assembly so that the screw
50s, tube 65 and needle 30 can move as a unit in the housing 40 to
extend and retract the needle tip 30t.
FIGS. 10A, 10B, 11A and 11B illustrate another embodiment of the
assembly 10''. In this embodiment, similar to the embodiment shown
in FIG. 1A, the outer wall 40w of the housing 40 can rotate to
engage the length adjustment mechanism 50'' which can comprise a
longitudinally extending internal screw 50s. The internal wall can
comprise threads 40t that engage the internal screw 50s so that
when a user rotates the outer wall 40w (i.e., a cylindrical
"knob"), the screw 50s moves longitudinally up and down. In some
embodiments, the screw 50s is bonded or otherwise affixed to the
needle 30 and does not rotate to move the needle 30 up and down
relative to the tubular cannula 20. The housing 40 can have upper
and lower members 146u, 146b that are static and do not rotate or
move in a longitudinal direction. In operation, a user can hold
onto one or both of these members 146u, 146b and rotate the
intermediate outer wall segment 40w to move the screw 50s up or
down and therefore move the needle 30 up or down relative to the
tubular cannula 20. A proximal end of the tubular cannula 20p can
terminate inside of and typically at a distal end of the housing
40d.
Referring to FIG. 11A, the screw 50s can be held by a hollow
internal tubular shaft 156 that can guide the screw 50s up and down
in the housing 40. The shaft 156 can have a wall 156w that has an
open longitudinally extending segment 158. The open segment can
extend circumferentially between about 15 to about 90 degrees. The
shaft 156 can connect/attach to the upper and lower stationary
members 146u, 146b. The longitudinally extending open segment 158
can be a cut out that is keyed to a matable internal anti-rotation
feature. The screw 50s can have a radially extending key feature
50k that can engage a slot in the housing 40 to provide
anti-rotational support.
Referring again to FIG. 11A, the upper and/or lower member 146u,
146b can have user-tactile engagement features 147 such as be
knurled, have a raised surface pattern and/or have a larger outer
dimension or feature (i.e., greater diameter, finger engagement
member such as a projection or fin or body with a larger radial or
lateral extent) relative to the rotatable cylindrical outer wall
segment 40w that can provide ease of user touch and hold during
use.
FIGS. 12A-12D also illustrate that the fluid transfer assembly 10''
can include a tube 65 that encloses the needle 30 and that extends
above the housing 40 to a connector 60, typically a luer connector
as discussed above.
Referring to FIGS. 12A-12D, the screw 50s can reside closer to the
distal end of the housing 40d when the needle tip 30t is extended,
compare, for example, FIGS. 12B-12D with the retracted
configuration shown in FIG. 12A.
FIGS. 12E and 12F illustrate exemplary attachment configurations of
components of the assembly 10''. The tube 65 can be attached to an
upper end of the screw 50s and can reside in the support shaft 156.
The opposing ends of the support shaft 156 can be affixed to the
respective upper and lower members 146u, 146b of the housing
40.
Optionally, the needle 30 can travel longitudinally maximally a
stroke distance between extended and retracted positions between
1-6 inches, such as between 2-4 inches, while the tubular cannula
20 is fixed in its length relative to the needle and/or housing
40.
Referring to FIG. 13, in some embodiments, the assembly 10, 10',
10'' can be used with a length of flexible (extension) tubing 240
which may be provided as an integrated subassembly 240a. In other
embodiments, the tubing 240 can be provided as a component separate
from the assembly 10, 10', 10'' for assembly prior to or during a
procedure. If so, the ends of the tubing 240 and/or connectors 60
and 160 may be capped or held in sterile sleeves or otherwise
package to maintain sterility or cleanliness.
In some embodiments, a length of the needle 30 or a cooperating
(fused silica) capillary tube 230 can be enchased in the flexible
tubing 240. The length may be a short or long length. The flexible
tubing 240 can protect a long length of the proximal end of the
needle 30, the length above and outside the housing 40, or another
downstream cooperating needle and/or capillary 230 attached thereto
where such a configuration is used.
In some embodiments, the long needle segment 230 can be one
continuous piece of fused silica glass that goes from the distal
end 240d of the tubing 240 at the connector 160 to the very
proximal end 240p, typically between about 4 feet to about 10 feet
long. The tubing 240 with the capillary/needle segment 230 can be
used to connect the needle 30 to the pump P (FIG. 9) or other
pressurized source and the delivery substance A can flow through
the tubing 240 to the needle 30 for delivery. Further, other MRI
compatible needle materials may be used. According to some
embodiments, the tubing 240 is flexible PVC tubing. According to
some embodiments, the tubing 240 is silicone tubing. The tubing 240
may have various lengths. For example, in some embodiments, the
tubing may be between about four to about ten feet (4 ft-loft) in
length, although other lengths are possible.
The tubular cannula 20 can have a rigid body. The cannula 20 may
comprise alumina/ceramic that can be MRI visible. The cannula 20
can have an outer surface having a lubricious coating and/or sleeve
23. The coating and/or sleeve can be a substantially transparent
polymeric material. Where a sleeve is used, the sleeve 23 can be a
thin flexible polymeric sleeve that can be conformably attached to
the underlying cannula body. The coating and/or sleeve can be
configured with sufficient strength to be able to retain components
of the cannula should the cannula fracture. The sleeve can be an
elastomeric shrink wrap or tube that can be heat-shrink applied to
the underlying body.
The assembly 10, 10', 10'' can be configured to flowably introduce
and/or inject a desired therapy substance (e.g., antigen, gene
therapy, chemotherapy or stem-cell or other therapy type).
The connector 160 can be configured as a luer lock to lock to the
connector 60 and the needle/tubing 240/230 can be operatively
coupled to an infusion pump P which supplies a mass flow of the
desired substance or material to be delivered into the patient.
As shown in FIGS. 14 and 15, the tubular cannula 20 can extend
through a tubular support 260 of a trajectory guide 250t that can
be held by a base or frame, e.g., a stereotactic frame that can be
secured to the patient or that can be secured to a holder residing
over the patient. See, e.g., U.S. Pat. Nos. 8,315,689, 8,175,677
and 8,374,677 and US Patent Application Publication No.
2010/0198052 (Ser. No. 12/694,865) for descriptions of patient
planning and entry protocols and frames and trajectory guides, the
contents of which are hereby incorporated by reference as if
recited in full herein.
In some embodiments, the needle 30 is configured to deliver a drug
therapy to the brain. The drug therapy can comprise substance S
(FIG. 15) delivered to the target site or region A through the
tubular cannula 20 and cooperating needle 30 may be any suitable
and desired substance for drug discovery, animal or human clinical
trials and/or approved medical procedures. According to some
embodiments, the substance S is a liquid or slurry. In the case of
a tumor, the substance may be a chemotherapeutic (cytotoxic) fluid.
In some embodiments, the substance can include certain types of
advantageous cells that act as vaccines or other medicaments (for
example, antigen presenting cells such as dentritic cells). The
dentritic cells may be pulsed with one or more antigens and/or with
RNA encoding one or more antigen. Exemplary antigens are
tumor-specific or pathogen-specific antigens. Examples of
tumor-specific antigens include, but are not limited to, antigens
from tumors such as renal cell tumors, melanoma, leukemia, myeloma,
breast cancer, prostate cancer, ovarian cancer, lung cancer and
bladder cancer. Examples of pathogen-specific antigens include, but
are not limited to, antigens specific for HIV or HCV. In some
embodiments, the substance S may comprise radioactive material such
as radioactive seeds. Substances S delivered to a target area in
accordance with embodiments of the present invention may include,
but are not limited to, the following drugs (including any
combinations thereof) listed in Table 1:
TABLE-US-00001 TABLE 1 DRUG (generic name) DISORDER(S) Caprylidene
Alzheimer's disease Donepezil Alzheimer's disease Galantamine
Alzheimer's disease Memantine Alzheimer's disease Tacrine
Alzheimer's disease vitamin E Alzheimer's disease ergoloid
mesylates Alzheimer's disease Riluzole Amyotrophic lateral
sclerosis Metoprolol Benign essential tremors Primidone Benign
essential tremors Propanolol Benign essential tremors Gabapentin
Benign essential tremors & Epilepsy Nadolol Benign essential
tremors & Parkinson's disease Zonisamide Benign essential
tremors & Parkinson's disease Carmustine Brain tumor Lomustine
Brain tumor Methotrexate Brain tumor Cisplatin Brain tumor &
Neuroblastoma Ioversol Cerebral arteriography Mannitol Cerebral
Edema Dexamethasone Cerebral Edema & Neurosarcoidosis Baclofen
Cerebral spasticity Ticlopidine Cerebral thrombosis/embolism
Isoxsuprine Cerebrovascular insufficiency Cefotaxime CNS infection
& Meningitis Acyclovir Encephalitis Foscarnet Encephalitis
Ganciclovir Encephalitis interferon alpha-2a Encephalitis
Carbamazepine Epilepsy Clonazepam Epilepsy Diazepam Epilepsy
divalproex sodium Epilepsy Ethosuximide Epilepsy Ethotoin Epilepsy
Felbamate Epilepsy Fosphenytoin Epilepsy Levetiracetam Epilepsy
Mephobarbital Epilepsy Paramethadione Epilepsy Phenytoin Epilepsy
Trimethadione Epilepsy Pregabalin Epilepsy & Neuralgia immune
globulin intravenous Guillain-Barre Syndrome interferon beta-1b
Guillain-Barre Syndrome & Multiple sclerosis Azathioprine
Guillain-Barre Syndrome & Multiple sclerosis &
Neurosarcoidosis Risperidone Head injury Tetrabenazine Huntington's
disease Acetazolamide Hydrocephalus & Epilepsy Alteplase
Ischemic stroke Clopidogrel Ischemic stroke Nimodipine Ischemic
stroke & Subarachnoid hemorrhage Aspirin Ischemic stroke &
Thromboembolic stroke Amikacin Encaphalitis Ampicillin Encaphalitis
ampicillin/sulbactam Encaphalitis Ceftazidime Encaphalitis
Ceftizoxime Encaphalitis Cefuroxime Encaphalitis Chloramphenicol
Encaphalitis cilastatin/imipenem Encaphalitis Gentamicin
Encaphalitis Meropenem Encaphalitis Metronidazole Encaphalitis
Nafcillin Encaphalitis Oxacillin Encaphalitis Piperacillin
Encaphalitis Rifampin Encaphalitis sulfamethoxazole/trimethoprim
Encaphalitis Tobramycin Encaphalitis Triamcinolone Encaphalitis
Vancomycin Encaphalitis Ceftriaxone Encaphalitis &
Neurosyphilis Penicillin Encaphalitis & Neurosyphilis
Corticotrophin Multiple sclerosis Dalfampridine Multiple sclerosis
Glatiramer Multiple sclerosis Mitoxantrone Multiple sclerosis
Natalizumab Multiple sclerosis Modafinil Multiple sclerosis
Cyclophosphamide Multiple sclerosis & Brain tumor &
Neuroblastoma interferon beta-1a Multiple sclerosis & Neuritis
Prednisolone Multiple sclerosis & Neurosarcoidosis Prednisone
Multiple sclerosis & Neurosarcoidosis Amantadine Multiple
sclerosis & Parkinson's disease Methylprednisolone Neuralgia
Desvenlafaxine Neuralgia Nortriptyline Neuralgia Doxorubicin
Neuroblastoma Vincristine Neuroblastoma Albendazole
Neurocystecercosis chloroquine phosphate Neurosarcoidosis
Hydroxychloroquine Neurosarcoidosis Infliximab Neurosarcoidosis
Pentoxyfilline Neurosarcoidosis Thalidomide Neurosarcoidosis
Apomorphine Parkinson's disease Belladonna Parkinson's disease
Benztropine Parkinson's disease Biperiden Parkinson's disease
Bromocriptine Parkinson's disease Carbidopa Parkinson's disease
carbidopa/entacapone/levodopa Parkinson's disease
carbidopa/levodopa Parkinson's disease Entacapone Parkinson's
disease Levodopa Parkinson's disease pergolide mesylate Parkinson's
disease Pramipexole Parkinson's disease Procyclidine Parkinson's
disease Rasagiline Parkinson's disease Ropinirole Parkinson's
disease Rotiotine Parkinson's disease Scopolamine Parkinson's
disease Tolcapone Parkinson's disease Trihexyphenidyl Parkinson's
disease Seleginline Parkinson's disease Rivastigmine Parkinson's
disease & Alzheimer's disease Anisindione Thromboembolic stroke
Warfarin Thromboembolic stroke 5-hydroxytryptophan Depression &
Anxiety & ADHD Duloxetine Depression & Anxiety &
Bipolar disorder Escitalopram Depression & Anxiety &
Bipolar disorder Venlafaxine Depression & Anxiety & Bipolar
disorder & Autism & Social anxiety disorder Desvenlafaxine
Depression & Anxiety & PTSD & ADHD Paroxetine
Depression & Anxiety & PTSD & Social anxiety disorder
fluoxetine/olanzapine Depression & Bipolar disorder
1-methylfolate Depression & BPD Amitriptyline Depression &
PTSD Sertraline Depression & PTSD & Bipolar disorder &
Social anxiety disorder Fluvoxamine Depression & PTSD &
Social anxiety disorder Olanzapine Depression & Schizophrenia
& Bipolar disorder Paliperidone Depression & Schizophrenia
& Bipolar disorder Aripiprazole Depression & Schizophrenia
& Bipolar disorder & Autism Quetiapine Depression &
Schizophrenia & PTSD & BPD & Bipolar disorder
Risperidone Depression & Schizophrenia & PTSD & BPD
& Bipolar disorder & Autism Amisulpride Depression &
Social anxiety disorder Chlorpromazine Psychosis Droperidol
Psychosis Fluphenazine Psychosis Periciazine Psychosis Perphenazine
Psychosis Thiothixene Psychosis Triflupromazine Psychosis
Haloperidol Psychosis & Dementia Prazosin PTSD Clozapine
Schizophrenia Flupenthixol Schizophrenia Iloperidone Schizophrenia
Loxapine Schizophrenia Mesoridazine Schizophrenia Promazine
Schizophrenia Reserpine Schizophrenia Thioridazein Schizophrenia
Zuclopenthixol Schizophrenia Asenapine Schizophrenia & Bipolar
disorder Levomepromazine Schizophrenia & Bipolar disorder
Ziprasidone Schizophrenia & Bipolar disorder Molindone
Schizophrenia & Psychosis Pimozide Schizophrenia &
Psychosis Thioridazine Schizophrenia & Psychosis Cytarabine
Chemotherapy, hematological malignancies
According to some embodiments, the assembly 10, 10', 10'' is
configured as an infusate delivery system that is delivered to a
patient at an infusion rate in the range of from about 1 to 3
.mu.L/minute.
Insertion of the surgical tubular cannula 20 (or any other
surgical, e.g., delivery, cannula) can be tracked in near real time
by reference to a void in the patient tissue caused by the cannula
20 and reflected in the MR image. In some embodiments, one or more
MRI-visible fiducial markers may be provided on the surgical
cannula 20 or housing 40, MR scanned and processed, and displayed
on the UI. In some embodiments, the surgical cannula 20 may itself
be formed of an MRI-visible material, MR scanned and processed, and
displayed on the UI.
According to some embodiments, the surgical cannula 20 may include
an embedded intrabody MRI antenna that is configured to pick-up MM
signals in local tissue during an MRI procedure. The MRI antenna
can be configured to reside on a distal end portion of the surgical
cannula. In some embodiments, the antenna has a focal length or
signal-receiving length of between about 1-5 cm, and typically is
configured to have a viewing length to receive MM signals from
local tissue of between about 1-2.5 cm. The MRI antenna can be
formed as comprising a coaxial and/or triaxial antenna. However,
other antenna configurations can be used, such as, for example, a
whip antenna, a coil antenna, a loopless antenna, and/or a looped
antenna. See, e.g., U.S. Pat. Nos. 5,699,801; 5,928,145; 6,263,229;
6,606,513; 6,628,980; 6,284,971; 6,675,033; and 6,701,176, the
contents of which are hereby incorporated by reference as if
recited in full herein. See also U.S. Patent Application
Publication Nos. 2003/0050557; 2004/0046557; and 2003/0028095, the
contents of which are also hereby incorporated by reference as if
recited in full herein.
While the surgical cannula 20 and needle 30 have been described by
way of example as delivery devices and methods for delivering a
substance to a patient, in accordance with some embodiments of the
invention, the cannula 20 and needle 30 and associated methods can
be used to withdraw a substance (e.g., spinal fluid, cardiac fluid
or neuro fluid) from a patient. Thus, it will be appreciated that
the devices and methods as disclosed herein can be used to transfer
a substance into and/or from a patient.
While the devices have been described herein primarily with
reference to MRI-guided insertion and infusion procedures, in some
embodiments the devices can be used in procedures without MRI
guidance.
While the surgical tubular cannula 20 has been described in use
with a trajectory guide 250t, the cannula 20 may be used with other
types of trajectory guidance or stereotactic frames or without a
stereotactic frame or trajectory guide.
FIG. 14 illustrates an MRI-guided interventional system 100 with an
MRI scanner 1220, a clinician workstation 1230 with at least one
circuit 1230c, at least one display 1232, an MRI compatible
trajectory guide 250t and a fluid transfer assembly 300 (including
the assembly 10, 10', 10'' and tubing 240 (FIG. 13). In some
embodiments, the fluid exchange (i.e., delivery) assembly 300 can
cooperate with an automated infusion pump P or, less preferably, a
manual syringe, or another pressurized delivery source.
The system 100 can be configured to render or generate near real
time or real time visualizations of the target anatomical space
using MRI image data and predefined data of at least one surgical
tool (e.g., tubular cannula 20, housing 40 and/or trajectory guide
250t) to segment the image data and place the trajectory guide 250t
and the cannula 20 in the rendered visualization in the correct
orientation and position in 3D space (which is the MRI surgical
space for MM embodiments), anatomically registered to a patient.
The trajectory guide 250t and the cannula 20 can include or
cooperate with tracking, monitoring and/or other interventional
components.
An exemplary trajectory guide 250t is illustrated in FIG. 14 in an
exemplary (head) position on a patient. However, the trajectory
guide can be used for any target location including, for example,
the spine. The trajectory guide 250t can be mounted over or on an
object, e.g., patient or subject, so that the upper receiving
tube/support column 260 (FIG. 15) is oriented substantially
perpendicular to the entry location (typically for spinal uses) or
may be mounted to extend outward from the patient entry location at
an angle as shown in FIG. 14.
The trajectory guide 250t typically provides X-Y adjustment and
pitch and roll adjustment in order to accurately position the
cannula 20 at a desired location within a patient. For additional
discussion of examples of suitable trajectory guides, see U.S. Pat.
No. 8,374,677, the contents of which are hereby incorporated by
reference as if recited in full herein. However, it is noted that
other trajectory guide configurations may be used and embodiments
of the invention are not limited by the examples of the trajectory
guides herein.
According to some embodiments, the systems are configured to
provide a substantially automated or semi-automated and relatively
easy-to-use MRI-guided system with defined workflow steps and
interactive visualizations. In particular embodiments, the systems
define and present workflow with discrete steps for finding target
and entry point(s), guiding the alignment of the targeting cannula
to a planned trajectory, monitoring the insertion of the tubular
(guide) cannula 20, and adjusting the (X-Y) position in cases where
the placement needs to be corrected. During steps where specific MR
scans are used, the circuit or computer module can display data for
scan plane center and angulation to be entered at the console. The
workstation/circuit can passively or actively communicate with the
MR scanner. The system can also be configured to use functional
patient data (e.g., fiber tracks, fMRI and the like) to help plan
or refine a target surgical site and/or access path.
The system 100 may also include a decoupling/tuning circuit that
allows the system to cooperate with an MRI scanner 1220 and filters
and the like. See, e.g., U.S. Pat. Nos. 6,701,176; 6,904,307 and
U.S. Patent Application Publication No. 2003/0050557, the contents
of which are hereby incorporated by reference as if recited in full
herein.
FIG. 16 is a flow chart of exemplary actions that can be carried
out according to embodiments of the present invention. A housing
holding a tubular cannula with an elongate needle extending through
the tubular cannula is provided so that a needle tip is external to
the tubular cannula (block 400). A screw or gear in the housing is
rotated to longitudinally translate the tubular cannula and/or the
needle tip out of the housing (block 410). Adjusting, in vivo, a
distance between the distal end of the tubular cannula and the
needle tip based on the longitudinal translation (block 420).
The housing can be attached to a length of tubing encasing a length
of capillary tubing forming part of the needle that extends outside
the housing that extends to a connector, the method includes
connecting the connector to another connector holding fused silica
capillary tubing inside a length of flexible tubing that is in
fluid communication with a pump (block 430).
A full stroke of translation can be between 0.5 inches and 2 inches
or about 1.6 inches, such as about 1.25 inches (block 440).
The needle can have a tip defined by an inner capillary tube and
can be fixedly attached to an outer capillary tube that defines an
increased outer wall segment a distance of 1-5 mm, typically 3 mm
from the tip (block 445).
Inserting the tubular cannula into a trajectory guide mounted to a
patient and rotating the screw while the tubular cannula held in
the trajectory guide (block 450).
The rotating can be carried out by rotating an outer wall of the
housing to rotate the screw (block 455).
The screw can be or gear can comprise a longitudinally extending
screw attached to an outerwall of the tubular cannula and the
housing has an inner wall segment with internal threads that engage
the screw attached to the tubular cannula to cause the translation
(block 460).
The screw or gear can comprise a longitudinally extending rack gear
that is attached to the needle and that can move the needle
relative to the tubular cannula in response to rotation of an
external thumb wheel that rotates a pinion that engages the rack
gear (block 462).
The cannula and needle can be an infusate ventricular delivery
system for brain delivery of a target substance to a target
anatomical region (block 465). For example, the device can be
configured to allow a single intrabody insertion of the needle 30
to a target anatomical region in the brain (such as tissue
generally in-line with and between the nose and back of the head
and, starting dispensing/infusing from the back of the head while
translating the needle frontward to treat a large volume through
one intrabody insertion of the needle).
The foregoing is illustrative of the present invention and is not
to be construed as limiting thereof. Although a few exemplary
embodiments of this invention have been described, those skilled in
the art will readily appreciate that many modifications are
possible in the exemplary embodiments without materially departing
from the teachings and advantages of this invention. Accordingly,
all such modifications are intended to be included within the scope
of this invention as defined in the claims. The invention is
defined by the following claims, with equivalents of the claims to
be included therein.
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